Download or read book Anisotropy and Microstructure of High Coercivity Rare Earth Iron Permanent Magnets List of Papers Published written by TECHNISCHE UNIV VIENNA (Austria) INST OF APPLIED AND TECHNICAL PHYSICS. and published by . This book was released on 1989 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: Partial Contents: Temperature Dependence of Anisotropy Fields and Initial Susceptibility in R2Fe14B Compounds; Magnetic and Anisotropy Studies of Nd-Fe-B Based Permanent Magnets; The Hard Magnetic Properties of Sintered Nd-Fe-B Permanent Magnets; Magnetic Phase Transitions and Magnetic Anisotropy in Nd2Fe(14-x)Co(x)B Compounds; Investigation of the Hysteresis Loop and the Magnetic Anisotropy of Nd-Fe-B Based Permanent Magnets; Does a Co Substitution Really Improve the Temperature Dependence of Nd-Fe-B Based Permanent Magnets; Magnetic Anisotropy in the System La2Fe(14-x)Co(x)B and its Relation to the System Nd2Fe(14-x)Co(x)B; The Effect of Substitution of Al on the Magnetic Properties of Nd15Fe78B7 Permanent Magnets; Electron Microscope Study of Precipitation in a Niobium Containing (Nd, Dy)-Fe-B Sintered Magnet; Microstructural Evidence for the Magnetic Surface Hardening of Dy203-Doped N15Fe77B8 Magnets; Magnetic Anisotropy in Pr2 (Fe(1-x)COx)14B Compounds; Anisotropy and Hysteresis Studies of Highly Substituted Nd-Fe-B Based Permanent Magnets; Electron Microscopy of Nd-Fe-B Based Magnets; and The Influence of Dopants on Microstructure and Coercivity of Nd-Fe-B Sintered Magnets. (jhd).
Download or read book Anisotropy and Microstructure of High Coercivity Rare Earth Iron Permanent Magnets written by and published by . This book was released on 1989 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Nd2 Fe14 B-based permanent magnets the coercivity is in practice only 20 - 40 % of the theoretical limits. The aim of this study is to investigate Nd-Fe-B based compounds with respect to their magnetic anisotropy behaviour and to characterize the microstructure of sintered Nd-Fe-B based permanent magnets. The anisotropy field HA was determined by using the Singular Point Detection (SPD) technique, and the microstructural investigations were carried out on a JEOL 200 CS analytical transmission electron microscope equipped with a high take-off energy dispersive (EDS) X-ray analyzer. Keywords: Magnetic anisotropy, Anisotropy field; pulsed field technique; Microstructure; electron microscopy; intrinsic coercive force; Nd-Fe-B permanent magnets.
Download or read book Anisotropy and Microstructure of Rare Earth Permanent Magnet Materials written by Peter Skalicky and published by . This book was released on 1986 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present report is divided into two parts, the microstructural investigations and the anisotropy measurements of rare earth permanent magnet materials. Section I shows that the hardmagnetic properties, i.e. coercivity, of the individual Nd-Fe-B permanent magnet material strongly depends on the compositional and processing parameters (milling, blending, annealing, etc.) and are directly correlated to the microstructural properties (grain size, composition and distribution of phases, crystal defects and precipitates) and to the magnetocrystalline anisotropy of the material. By means of transmission electron microscopy together with STEM X-ray microanalysis at least three categories of phases wee identified in sintered rare earth-iron permanent magnets. From microstructural investigations it can be assumed that the coercivity of sintered rare earth-iron permanent magnet materials is controlled by the nucleation and expansion fields for reversed domains. In Section II the magnetic anisotropy measurements of various rare earth-iron based magnets between 80 K and the Curie temperature are shown and the results are discussed by means of a expanded model for the anisotropy field. From the study of the temperature dependence of the anisotropy field of the mixed crystal series (N, RE)15Fe77B8 (RE=Y, La, Ce) the One Ion Character of the Nd sublattice is shown.
Download or read book Rare earth Iron Permanent Magnets written by J. M. D. Coey and published by Oxford University Press. This book was released on 1996 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rare-earth iron permanent magnets combine the magnetization of iron or cobalt with the anisotropy of a light rare-earth in intermetallic compounds which exhibit nearly ideal hysteresis. The rare-earth iron magnets are indispensable components in a vast range of electronic and electromechanical devices. This book covers the principles of permanent magnetism, magnet processing, and applications in a series of interlocking chapters written by experts in each area. Based on the findings of the Concerted European Action on Magnets, it is a definitive account of the field, designed to be read by physicists, materials scientists, and electrical engineers.
Download or read book Rare Earth Permanent Magnets written by I.R. Harris and published by Elsevier. This book was released on 2014-04-03 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: These papers provide an interesting collection of contributions on fundamental magnetic behaviour, microstructural studies, processing methods and applications of rare earth, iron-rich, high performance permanent magnets. The remarkably versatile nature of the Nd-Fe-B-type alloys with respect to magnet processing is very evident in these proceedings. Thus there are papers which describe the production of magnets by the die-upset-forging of melt-spun ribbon, by cold-compaction of melt-spun-ribbon with soft metals, by mechanical alloying and by hot working of cast material. Work is also reported on the production of new permanent magnets from melt-spun material based on the alloys Nd4Fe78B18 and SmFe11.5Ti1.04. Both these alloys look promising and the former appears to be close to commercial exploitation.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rare Earth Permanent Magnets written by A.S. Nowick and published by Elsevier. This book was released on 2012-12-02 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rare Earth Permanent Magnets presents the discussion of the metallurgy and properties of rare earth permanent magnet alloys. The monograph initially provides the elementary aspects of magnetism to enable the reader sufficient understanding of permanent magnetism. The book then discusses the rare earth elements and their alloys with cobalt, copper, and iron; the magnetic properties of various intermetallic compounds relevant to permanent magnets; a detailed account of cast permanent magnets of the Co-Cu-Sm and Co-Cu-Ce systems and their modifications; the important methods of making and manufacturing rare earth permanent magnets by powder metallurgy methods; and comparisons between the well-known permanent magnets and the new rare earth materials. This text will be of value to students, materials engineers, and scientists.
Download or read book Fundamental Magnetic Studies of Iron rare earth metalloid Alloys Final Technical Report written by and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objective was to understand strongly magnetic rare earth-transition metal compounds and alloys, with potential use as hard or semi-hard permanent magnet materials. Efforts were focused on three areas: search for Fe-rich new phases and compounds with high magnetization, anisotropy, and Curie temperature; use of rapid solidification (melt-spinning) to produce fine grain and high coercivity; and relation of hard magnetic properties to microstructure and domain structure. Coercivities of up to 10 to 15 kOe have been produced.
Download or read book Proceedings of the Eleventh International Workshop on Rare Earth Magnets and Their Applications and the Sixth International Symposium on Magnetic Anisotropy and Coercivity in Rare Earth Transition Metal Alloys Symposium written by S. G. Sankar and published by . This book was released on 1990 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rare Earth Permanent Magnet Alloys High Temperature Phase Transformation written by Shuming Pan and published by Springer. This book was released on 2014-12-01 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: The process of high temperature phase transition of rare earth permanent-magnet alloys is revealed by photographs taken by high voltage TEM. The relationship between the formation of nanocrystal and magnetic properties is discussed in detail, which effects alloys composition and preparation process. The experiment results verified some presumptions, and were valuable for subsequent scientific research and creating new permanent-magnet alloys. The publication is intended for researchers, engineers and managers in the field of material science, metallurgy, and physics. Prof. Shuming Pan is senior engineer of Beijing General Research Institute of Non-ferrous Metal.
Download or read book Rare Earth Permanent Magnets written by E. A. Nesbitt and published by Academic Press. This book was released on 1973-01-28 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rare Earth Permanent Magnets presents the discussion of the metallurgy and properties of rare earth permanent magnet alloys. The monograph initially provides the elementary aspects of magnetism to enable the reader sufficient understanding of permanent magnetism. The book then discusses the rare earth elements and their alloys with cobalt, copper, and iron; the magnetic properties of various intermetallic compounds relevant to permanent magnets; a detailed account of cast permanent magnets of the Co-Cu-Sm and Co-Cu-Ce systems and their modifications; the important methods of making and manufacturing rare earth permanent magnets by powder metallurgy methods; and comparisons between the well-known permanent magnets and the new rare earth materials. This text will be of value to students, materials engineers, and scientists.
Download or read book Microstructure and Coercivity of Rare Earth Iron Permanent Magnet Materials written by Johannes Bernardi and published by . This book was released on 1993 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1989-12 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamental Magnetic Studies of Iron rare earth metalloid Alloys written by and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objective was to understand strongly magnetic rare earth-transition metal compounds and alloys, with potential use as hard or semi-hard permanent magnet materials. Efforts were focused on three areas: search for Fe-rich new phases and compounds with high magnetization, anisotropy, and Curie temperature; use of rapid solidification (melt-spinning) to produce fine grain and high coercivity; and relation of hard magnetic properties to microstructure and domain structure. Coercivities of up to 10 to 15 kOe have been produced.
Download or read book Proceedings of the Eleventh International Workshop on Rare Earth Magnets and Their Applications and the Sixth International Symposium on Magnetic Anisotropy and Coercivity in Rare Earth Transition Metal Alloys Pittsburgh Pennsylvania USA October 1990 written by S. G. Sankar and published by . This book was released on 1990 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Rapidly Quenched Rare Earth Iron Alloys for Permanent Magnets written by G. C. Hadjipanayis and published by . This book was released on 1985 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: In early in 1985 the potential of FeNd (Pr) B (SI) alloys for permanent magnet development was demonstrated. The progress under consideration was initiated in April 1983, to study the properties of these materials in more details and in particular to understand the origin of magnetic hardening by correlating the magnetic properties with the microstructure determined by transmission electron microscopy. The magnetic properties of melt-spun Fe-R-B alloys have been examined in the whole rare-earth series. The tetragonal Fe14R2B phase occurs in all alloys studied except in Eu and Yb containing alloys. The Curie temperature of this phase increases from about 170C in Fe14CeB to 375 for Fe14Gd2B and then decreases for the heavier rare-earths and is only 320 C in Fe14Ho2B. In heavy rare-earths, a second phase with a higher Curie temperature approx.(470 C) has also been observed. The nature of this phase is not yet known. The magnetic hysteresis properties of melt-spun Fe-light rare-earth-boron alloys were examined and maximum coercivities were found to scale with the anisotropy fields.
Download or read book Proceedings of the Eighth International Workshop on Rare earth Magnets and Their Applications and the Fourth International Symposium on Magnetic Anisotropy and Coercivity in Rare Earth Transition Metal Alloys Dayton Ohio USA May 1985 written by Karl J. Strnat and published by . This book was released on 1985 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt:
